https://www.asus.com/us/Motherboards/H97MECSM/specifications/
1 x M.2 Socket 3, , with M Key, type 2260/2280 storage devices support (both SATA & PCIE mode)
https://www.asus.com/us/Motherboards/H97MECSM/specifications/
1 x M.2 Socket 3, , with M Key, type 2260/2280 storage devices support (both SATA & PCIE mode)
so it would work with an intel optane? or this? M600 M.2 2280 512GB SATA III MLC